plasma.Coroutineは死にました

Main.cpp

#include<Siv3D.hpp>
#include<boost/coroutine2/all.hpp>
#include<boost/optional.hpp>

std::vector<int> vec;
boost::optional<int> opt;
constexpr int count = 2;
std::wstring str;
const wchar_t message[] = L"新しい数字を入力するが良い";

void test(boost::coroutines2::coroutine<int>::push_type& yield)
{
	while (true)
	{
		if (opt)
		{
			vec.emplace_back(*opt);
			str.clear();
			for (auto const& c : message)
			{
				str += c;
				for (int i{};i < count;++i)
				{
					yield(0);
				}
			}
			str += L"▼";
			opt.reset();
			yield(1);
		}
		yield(0);
	}
}

void Main()
{
	boost::coroutines2::coroutine<int>::pull_type Test(test);
	s3d::Key input[] = 
	{
		s3d::Input::Key0,
		s3d::Input::Key1,
		s3d::Input::Key2,
		s3d::Input::Key3,
		s3d::Input::Key4,
		s3d::Input::Key5,
		s3d::Input::Key6,
		s3d::Input::Key7,
		s3d::Input::Key8,
		s3d::Input::Key9
	};
	bool f{};
	s3d::Font font(30);
	str = L"数字を入力するがよい";
	while (s3d::System::Update())
	{
		if (!f)
		{
			for (int i{};i < std::size(input);++i)
			{
				if (input[i].clicked)
				{
					opt.emplace(i);
					f = true;
					break;
				}
			}
		}
		if (Test().get() == 1)
		{
			f = false;
		}
		for (int i{};i < vec.size();++i)
		{
			font(vec[i]).draw(i * 24, 0);
		}
		font(str).draw(0, 36);
	}
}